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This is astable multivibrator circuit or Square-Wave Oscillator
or basic pulse generator it use op-amp IC-1458 is main parts and a few parts.
By have Vsat value size as same as with power supply voltage. The frequency Output set by value R1
and C1.
Frequency Oscillator output = 1/(2R1.C1.ln3)
The C1 capacitor to change capacitance per frequency value 1uF = [...]

This is an animal origin, a simple circuit. Interesting, because an IC package and a simple good
Operation of the circuit. This circuit, an IC, a number HT82231 IC package that has other audio source animals. The origin of the sound depends on the switch S1-S8 of switch.
Each is a different animal sounds and choose to [...]

This is a multi-purpose integrated music box that interesting, because an IC package. Is a simple and affordable.
The main function of the circuit is the device of the circuit is IC1. This is a sound generator IC. The Christmas season. Its musical all 8 music. When the power supply LDR1 the exposure will cause voltage [...]